What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I made a test using the form on mobile browser and it was working just fine.
Here is the video of the test.
Were you not getting similar responsive behavior? Was the form embedded on a website? If it is share also to us the URL of your website and we will also test the embedded form.